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Notes Payable (Details) - USD ($)
3 Months Ended
Dec. 31, 2019
Oct. 01, 2019
Sep. 30, 2019
Debt Instrument [Line Items]      
Document Period End Date Dec. 31, 2019    
Unsecured:      
Notes payable $ 3,783,300,000   $ 3,399,400,000
Home Building [Member]      
Debt Instrument [Line Items]      
Debt Repurchase Authorization Remaining 500,000,000    
Unsecured:      
Notes payable 2,470,000,000.0   2,047,600,000
Revolving credit facility 0   0
Unamortized Debt Issuance Expense 8,600,000   5,400,000
Forestar Group [Member]      
Unsecured:      
Notes payable 462,100,000   460,500,000
Financial Services [Member]      
Unsecured:      
Notes payable 850,200,000   888,900,000
Forestar Group [Member]      
Unsecured:      
Notes payable 463,100,000   462,900,000
Revolving credit facility $ 0   0
4.0% senior notes due 2020 [Member] | Home Building [Member]      
Unsecured:      
Stated interest rate 4.00%    
Notes payable $ 499,900,000   499,600,000
2.55% senior notes due 2020 [Member] | Home Building [Member]      
Unsecured:      
Stated interest rate 2.55%    
Notes payable $ 399,100,000   398,900,000
4.375% senior notes due 2022 [Member] | Home Building [Member]      
Unsecured:      
Stated interest rate 4.375%    
Notes payable $ 348,900,000   348,800,000
4.75% senior notes due 2023 [Member] | Home Building [Member]      
Unsecured:      
Stated interest rate 4.75%    
Notes payable $ 299,000,000.0   298,900,000
5.75% senior notes due 2023 [Member] | Home Building [Member]      
Unsecured:      
Stated interest rate 5.75%    
Notes payable $ 398,400,000   398,400,000
SeniorNoteFortyTwo [Member] | Home Building [Member]      
Unsecured:      
Stated interest rate 2.50% 2.50%  
Notes payable $ 495,800,000 $ 500,000,000 0
Debt Instrument, Interest Rate, Effective Percentage   2.70%  
3.75% convertible senior notes due 2020 [Member] | Forestar Group [Member]      
Unsecured:      
Stated interest rate 3.75%    
3.75% convertible senior notes due 2020 [Member] | Forestar Group [Member]      
Unsecured:      
Notes payable $ 119,000,000.0   119,100,000
Senior Note Member Forty One [Member] | Forestar Group [Member]      
Unsecured:      
Stated interest rate 8.00%    
Unamortized Debt Issuance Expense $ 5,900,000   6,200,000
Senior Note Member Forty One [Member] | Forestar Group [Member]      
Unsecured:      
Notes payable 344,100,000   343,800,000
Secured Debt [Member] | Home Building [Member]      
Unsecured:      
Notes payable $ 28,900,000   $ 103,000,000.0